ini_get_all
This version of return_bytes takes care of the MB, GB, KB cases along with the M,G,K ones.
Hope this is helpful!
<?php
public static function return_bytes ($val)
{
if(empty($val))return 0;
$val = trim($val);
preg_match('#([0-9]+)[\s]*([a-z]+)#i', $val, $matches);
$last = '';
if(isset($matches[2])){
$last = $matches[2];
}
if(isset($matches[1])){
$val = (int) $matches[1];
}
switch (strtolower($last))
{
case 'g':
case 'gb':
$val *= 1024;
case 'm':
case 'mb':
$val *= 1024;
case 'k':
case 'kb':
$val *= 1024;
}
return (int) $val;
}
?>
ini_get
(PHP 4, PHP 5)
ini_get — Lit la valeur d'une option de configuration
Description
string ini_get
( string
$varname
)
Retourne la valeur de l'option de configuration
varname en cas de succès.
Liste de paramètres
-
varname -
Le nom de l'option de configuration.
Valeurs de retour
Retourne la valeur de l'option de configuration
varname en cas de succès, ou une
chaîne de caractères vide pour les valeurs NULL. Retourne FALSE
si l'option de configuration n'existe pas.
Exemples
Exemple #1 Exemples avec ini_get()
<?php
/*
Notre fichier php.ini contient les directives suivantes :
display_errors = On
register_globals = Off
post_max_size = 8M
*/
echo 'display_errors = ' . ini_get('display_errors') . "\n";
echo 'register_globals = ' . ini_get('register_globals') . "\n";
echo 'post_max_size = ' . ini_get('post_max_size') . "\n";
echo 'post_max_size+1 = ' . (ini_get('post_max_size')+1) . "\n";
echo 'post_max_size in bytes = ' . return_bytes(ini_get('post_max_size'));
function return_bytes($val) {
$val = trim($val);
$last = strtolower($val[strlen($val)-1]);
switch($last) {
// Le modifieur 'G' est disponible depuis PHP 5.1.0
case 'g':
$val *= 1024;
case 'm':
$val *= 1024;
case 'k':
$val *= 1024;
}
return $val;
}
?>
L'exemple ci-dessus va afficher quelque chose de similaire à :
display_errors = 1 register_globals = 0 post_max_size = 8M post_max_size+1 = 9 post_max_size in bytes = 8388608
Notes
Note: Lecture de valeurs booléennes
Une directive de configuration ayant la valeur de off sera retourné sous la forme d'une chaîne vide ou "0" alors que la valeur on retournera "1". Cette fonction peut également retourner la valeur littérale du fichier INI.
Note: Lors de la lecture des tailles de mémoire
Plusieurs directives traitant de taille mémoire, comme upload_max_filesize, sont stockées dans le fichier php.ini avec une notation courte. ini_get() retourne la chaîne exacte stockée dans le fichier php.ini et NON PAS son équivalent entier. Appliquer des opérations arithmétiques classiques sur ces valeurs ne conduira à rien de bon. L'exemple ci-dessous montre une façon de convertir la notation sténographique en octets, de la même façon dont le fait le source PHP.
Voir aussi
- get_cfg_var() - Retourne la valeur d'une option de PHP
- ini_get_all() - Lit toutes les valeurs de configuration
- ini_restore() - Restaure la valeur de l'option de configuration
- ini_set() - Modifie la valeur d'une option de configuration
add a note
User Contributed Notes
ini_get
Ivo Mandalski
15-Nov-2011 08:27
Stas Trefilov, OpteamIS
26-Mar-2010 10:08
another version of return_bytes which returns faster and does not use multiple multiplications (sorry:). even if it is resolved at compile time it is not a good practice;
no local variables are allocated;
the trim() is omitted (php already trimmed values when reading php.ini file);
strtolower() is replaced by second case which wins us one more function call for the price of doubling the number of cases to process (may slower the worst-case scenario when ariving to default: takes six comparisons instead of three comparisons and a function call);
cases are ordered by most frequent goes first (uppercase M-values being the default sizes);
specs say we must handle integer sizes so float values are converted to integers and 0.8G becomes 0;
'Gb', 'Mb', 'Kb' shorthand byte options are not implemented since are not in specs, see
http://www.php.net/manual/en/faq.using.php#faq.using.shorthandbytes
<?php
function return_bytes ($size_str)
{
switch (substr ($size_str, -1))
{
case 'M': case 'm': return (int)$size_str * 1048576;
case 'K': case 'k': return (int)$size_str * 1024;
case 'G': case 'g': return (int)$size_str * 1073741824;
default: return $size_str;
}
}
?>
nicolas dot grekas+php at gmail dot com
19-Aug-2009 10:51
Here is how to accurately test for boolean php.ini values:
<?php
function ini_get_bool($a)
{
$b = ini_get($a);
switch (strtolower($b))
{
case 'on':
case 'yes':
case 'true':
return 'assert.active' !== $a;
case 'stdout':
case 'stderr':
return 'display_errors' === $a;
default:
return (bool) (int) $b;
}
}
?>
Nathaniel Sabanski
15-Mar-2009 02:20
Here's a simplified version of return_bytes() that does not rely on non-breaking cases and variable variables.
<?php
function return_bytes($val)
{
$val = trim($val);
$last = strtolower(substr($val, -1));
if($last == 'g')
$val = $val*1024*1024*1024;
if($last == 'm')
$val = $val*1024*1024;
if($last == 'k')
$val = $val*1024;
return $val;
}
?>
peter
29-Jul-2008 02:25
The above example function called return_bytes() assumes that ini_get('upload_max_filesize') delivers only one letter at the end. As I've seen 'Mb' and things like that, I'd suggest to change the $last = ... part into $last = strtolower(substr($val,strlen($val/1),1)).
I'd call it $unit then.
filh at filh dot org
21-Nov-2005 06:24
Concerning the value retourned, it depends on how you set it.
I had the problem with horde-3 which test the safe_mode value.
THan :
- if you set the value with php_admin_value safe_mode Off (or On) ini_get returns the string
- if you set the value with php_admin_flag safe_mode Off (or On) ini_get returns the boolean.
31-Oct-2005 11:16
Important: The manual says that ini_get will return 0 or an empty string for boolean config values that are set to off in php.ini.
This is technically correct, however when you use
php_value register_globals off
in an .htaccess file, ini_get will return the string, which will "evaluate" to 1. So if you are using mod_php you have to check boolean config values against the strings (upper/lowercase etc.) anyhow or you will get wrong results.
david dot tulloh at infaze dot com dot au
21-Jun-2005 07:01
You can set custom entries in the ini file to provide globals such as database details.
However these must be retrieved with get_cfg_var, ini_get won't work.
Der Graph
16-Aug-2004 11:59
It might be useful for included scripts that include other files to extend the 'include_path' variable:
<?php ini_set('include_path',ini_get('include_path').':../includes:'); ?>
Sometimes, it may also be useful to store the current 'include_path' in a variable, overwrite it, include, and then restore the old 'include_path'.
fbeyer at <nospam>clickhand dot de
13-Aug-2002 07:29
If you want to test ini flags (eg. On/Off), I recommend to explicitly cast the value returned by ini_get() to boolean - it is cleaner as you only get true or false, not 0 or 1 or "" as described above.
<?php
$register_globals = (bool) ini_get('register_gobals');
?>
C fans may of course also cast it to (int) to play with 0 and 1 - that's also cleaner to print().